Add to CHANGELOG

Signed-off-by: Craig Perkins <[email protected]>

Author: cwperks

CHANGELOG.md

@@ -6,6 +6,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.1.0/)
 ## [Unreleased 3.0](https://github.com/opensearch-project/anomaly-detection/compare/2.x...HEAD)
 ### Features
 ### Enhancements
+- Use testclusters when testing with security ([#1414](https://github.com/opensearch-project/anomaly-detection/pull/1414))
 ### Bug Fixes
 ### Infrastructure
 ### Documentation